Abstract
There are three sets of source rocks in the lower assemblage of Yanchang formation in Wuqi area of Ordos Basin, and the source of Chang-8 crude oil is unknown. Through analysis of geochemical indexes of Chang-7, Chang-8, and Chang-9 source rocks and Chang-8 reservoir extracts, it is found that the relative abundance of δ13C, Pr/Ph and hopanoid compounds (C30H-C30DiaH-Ts) can well distinguish between them. The oil-source correlation results show that the geochemical characteristics of Chang-8 reservoir extracts is more similar to that of Chang-7 source rocks, indicating that Chang-8 crude oil is supplied by Chang-7 source rocks.
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